strange sound

Brand new Raptor <400 miles. runs great. Goes into Drive kinda hard at times but really no other issues at all except...when going any speed above 30mph and i floor it, for a split second I hear a funny screech like sound from right rear area. No skips, no warning lights and if I gradually press pedal to floor I dont hear it. Any ideas?

odd thing today was that i couldnt get it to make the sound. maybe it was just a glitch.